What was found
DURING HEAVY MAINTENANCE: CORROSION: CTR LH LONGITUDINAL BEA, FR12-14, 17, AND 19-20 SEAT TRACK @ FWD FUSE PAX CABIN FLOOR STRUCTURE (W1); REF TOMX W/O N249JB/2525/E190/BRIDGE NR-00112: EVALUATED CORROSION AND DEEMED OUT OF LIMITS IAW E190 SRM 53-10-10 AD52. R & R LH LONGITUDINAL SECTION BEAM FR12-20 IAW SRM 51-41-01, 51-41-02, 51-43-03, AND SRM 51-43-04.(CONSIDERED A MAJOR REPAIR)